Propeller.



R. R. BEVIS.

PBOPELLBB.

APPLICATION FILED xov.1a, 191a.

Patented Mar. 23, 1915.

2 BHEETHHEET 1.

R. R. BEVIS.

PBOPBLLEB.

APPLIGATIOH TILED HOV.13, 1912- 1,133,222 Patented Mar. 23, 1915.

2 BHEETBSHBET 2.

RiESTAL RATSEY BEVIS, OF BIRKENHEAD, ENGLAND.

PROPELLER.

Specification of Letters Patent.

Patented Mar. 23, 1915.

Application filed November 13, 1912. Serial No: 731,177.

To all whom it may concern:

Be it known that I, RESTAL RATSEY BEVIS, a subject of the King ofEngland, residing at Hamptoune, Vyner Road, Birkenhead,

'5 in the county of Chester, England, have invented new and usefulImprovements in or Connected with Propellers, of which the following isa specification.

This invention has reference to ships screw propellers wherein theblades are movable circularly in the boss, for feathering and reversing;and this movement is effected by racks engaging with teeth or the likeon the blade roots, and connected together by a common crosshead orconnection; the object of the present invention being to provide animproved arrangement and combination of parts in feathering screwpropellers of the kind above referred to.

Under this invention, the arrangement and combination of parts of thepropeller are as followsThe axes of the propeller blades in the boss liein the same transverse plane, and the blade roots are each provided withteeth in the form of a pinion, and the racks which engage with thesepinions, are carried from a common yoke or connecting piece orcrosshead, fitted on and fastened to and moved longitudinally, by alongitudinally movable central rod or shaft within the main propellershaft; while the end of this main shaft passes through the boss, anditthe b0ss'is held on the shaft by a nut or the like at the after end.This special arrangement and combination, of which the inventionconsists, is illustrated in the annexed drawings, in which is shown, in

Figure 1, a longitudinal section, in Fig. 2 an end view, and in Fig. 3 apart plan, of a propeller so constructed and arranged.

In these drawings, 1 represents the boss of the propeller; 2 are themovable blades; 3 are the roots of the blades; and 4 the toothed pinionon each. 5 are the two racks engaging with the pinions 4 on the oppositeside of the axis; and*6 is the yoke or crosshead which carries theseracks, the crosshead being common to and carrying both; and 7 is themain propeller shaft over which the boss is fitted and held; and 8 theinner central longitudinal movable spindle or shaft on which thecrosshead carrying rack 6 is fixed.

The propeller blades 2 are held in position in the boss 1 by angularflange rings 10, the flanges of which are held on to the boss 1 by thestud bolts 11, and come outside and hold in position the shoulder orcollar 12 on the root 3; while the other portion of I the angularflanges, fit over the circular or cylinder portion 13 of the root of theblade which comes outside the collar 12; and supports the blade at thispoint or part, while the part 3 which lies within the boss proper 1, issupported by it.

The two racks 5, so far as concerns their relation to the longitudinalvertical plane of the shaft axis, is. shown clearly in Fig. 2; and theyface each other so that the blades 2 are both turned in the samedirection as regards rotation.

The means of moving the racks 5 longi tudinally through the shaft 8 isby a groove sleeve device of known type marked 15, adapted to slidealong the part 16 of the shaft; the connection between the sleeve 15,and the inner rod or shaft 8 being by a pin 19, fixed at its end in the'sleeve 15, and passing through a part 20 fixed on the end of the shaft8; the aperture through which the pin 19 passes and in which it works,being elongated, and the grooved sleeve 15 being adapted to be moved toand fro by a lever, not shown, similarly as used in operating a clutch.

It is to be noted that the racks 5 pass through a metal ring 21, in theboss 1 of the propeller, they being su ported at the back by a part 22;the prope ler boss itself being chambered as shown internally; and bythe manner of attaching and holding the blades in the boss 1, that is,by the annular flange or ring 10 near the root of the blade, they cannotbecome unseated or work loose, or fall out.

It is to be stated that it is well known that racks have been proposedto be used for operating upon teeth or toothed pinions on the roots ofpropeller blades for turning them; and that these racks, on oppositesides of the roots hay e been connected up by a yoke or crosshead, andworked by a longitudinally disposed inner shaft or rod; and no claimgenerally is made to same.

What I claim is A reversible propeller comprising in combinationpropeller blades having roots fitted with pinions and provided withcylindrical portions and collars; a main propeller shaft; a centralshaft insaid main.shaft; a yoke with racks on the end of the centralshaft In testimony whereof I have signed my and meshing with thepinions; a hollow boss name to this specification in the presence of 10halviililg relcessmli1 parlts;dandlangular flafngles two subscribingwitnesses.

w ic inc ose t e c in rica portions 0 t e blades, and take iri to therecessed arts of RESTAL RATSEY BEVIS' the boss, and secure the collarson t e roots Witnesses:

against the boss part; substantially as set F. R. PENNINGTON,

forth. JAMES A; Bnownn.

